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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d60dfa3e2837de38cc0ac8ce87ed88a99d8da1b0b97f75de67d4eeffcfc7a2f' 
  AND token = 'b6DqOLXUqXdOAJtGiQmUnQPIJGlRskWgL/CVw9xmQYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}